Abstract
The adaptability of vehicle-mounted heating systems that include burner and stove remarkably influences the system efficiency, heat flux uniformity, and pollutants emission. In this work, the performance of a rotary cup burner assembly with three different cooking stoves was investigated using ANSYS Fluent software based on five factors of thermal efficiency, heat transfer intensity, heating uniformity, CO emissions, and flue gas outlet temperature. The Eulerian-Lagrangian method was used to perform the diesel spray, and the shear stress transfer k-ω turbulence model and the probability density function model were employed to simulate the turbulent combustion. Based on the simulation results, the performance pentagon of the above five factors was constructed to evaluate the comprehensive performance of the new rotary cup burner system. The rotary cup burner had a good performance when it is used in two staple food stoves and a subsidiary food stove. In staple food stove A, its higher furnace increased the heat exchange area of the vessel, while the higher fireboard of staple food stove B caused a higher heat transfer intensity at the bottom of the vessel. However, the higher fireboard also led to higher CO emissions. In consideration of these two factors, the thermal efficiency of stove A was about 7% higher than that of stove B. Different from the staple food stove, the furnace of subsidiary food stove C had better wrapping to the bottom of the boiler so that it had the highest heat transfer intensity. The obtained performance pentagon shows that the comprehensive adaptability performance of stove A was the best and that of stove B was the worst, which is mainly caused by the height of the fireboard and the shape of the vessel. This research guides the optimization of the heating system and promotes the application of the rotary cup burner.
Highlights
According to the experiment results, we found that the structure of the combustion chamber and stove remarkably influence the system efficiency, heating uniformity, and pollutants emission when the rotary cup burner is assembled with different vehiclemounted cooking stoves
The results show that the outlet flue gas temperatures of the three models of fuel oil cooking stoves are all above 900 K, which is caused by the set adiabatic wall conditions and by ignoring the heat loss of the combustion chamber and the outer wall of the flue
The simulation reof thermal efficiency, heat transfer intensity, heat flux uniformity, CO emissions, and flue sults of thermal efficiency, heat transfer intensity, heat flux uniformity, CO emissions, and gas temperature at the outlet of the model are normalized as K1, K2, K3, K4, and K5 to flue gas temperature at the outlet of the model are normalized as K1, K2, K3, K4, and K5 to form a performance pentagon, in order to comprehensively and intuitively compare the performance of different cooking stoves
Summary
Fuel oil cooking stove is important vehicle-mounted cooking equipment with high heat density, which can provide daily food security for large groups is mainly composed of a burner and combustion chamber. The spray flame and the flow of high-temperature flue gas need to rotate 90 degrees in the combustion chamber to heat the vessel because of the horizontal correlation between the flame direction and the heating transfer surface [26] This leads to a relatively poor heating uniformity and thermal efficiency of the heating system. Different from the solo performance factor, the performance analysis of rotary cup burner assembly with three vehicle-mounted cooking stoves was conducted by comparing with five factors (thermal efficiency, heat transfer intensity, heating uniformity, CO emission, and flue gas temperature) in this work. In order to analyze whether the rotary cup burner is suitable for the cooking stoves (one subsidiary food stove and two staple food stoves), the steady-state numerical simulation of fuel oil cooking stoves using three different combustion chamber structures was carried out, and the comprehensive performance of stove was compared and analyzed based on multiple characteristics. The key structural parameters affecting the performance were obtained from the comparison of different structures
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